import CryptoJS from "crypto-js";

// 默认的 KEY 与 iv 如果没有给
const KEY = CryptoJS.enc.Utf8.parse(process.env.UMI_APP_AES_KEY || "");
const IV = CryptoJS.enc.Utf8.parse(process.env.UMI_APP_AES_IV || "");
/**
 * AES加密 ：字符串 key iv  返回base64
 */
export function encrypt(word: string, keyStr?: string, ivStr?: string): string {
  let key = KEY;
  let iv = IV;

  if (keyStr) {
    key = CryptoJS.enc.Utf8.parse(keyStr);
    iv = CryptoJS.enc.Utf8.parse(ivStr || "");
  }

  let srcs = CryptoJS.enc.Utf8.parse(word);
  var encrypted = CryptoJS.AES.encrypt(srcs, key, {
    iv: iv,
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.ZeroPadding,
  });
  return CryptoJS.enc.Base64.stringify(encrypted.ciphertext);
}
/**
 * AES 解密 ：字符串 key iv  返回base64
 *
 */
export function decrypt(word: string, keyStr: string, ivStr: string) {
  let key = KEY;
  let iv = IV;

  if (keyStr) {
    key = CryptoJS.enc.Utf8.parse(keyStr);
    iv = CryptoJS.enc.Utf8.parse(ivStr);
  }

  let base64 = CryptoJS.enc.Base64.parse(word);
  let src = CryptoJS.enc.Base64.stringify(base64);

  var decrypt = CryptoJS.AES.decrypt(src, key, {
    iv: iv,
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.ZeroPadding,
  });

  var decryptedStr = decrypt.toString(CryptoJS.enc.Utf8);
  return decryptedStr.toString();
}
